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M27W512 Datasheet(PDF) 7 Page - STMicroelectronics |
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M27W512 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 22 page M27W512 Device operation 7/22 2 Device operation The modes of operations of the M27W512 are listed in Table 2: Operating modes. A single power supply is required in the read mode. All inputs are TTL levels except for GVPP and 12V on A9 for Electronic Signature. 2.1 Read mode The M27W512 has two control functions, both of which must be logically active in order to obtain data at the outputs. Chip Enable (E) is the power control and should be used for device selection. Output Enable (G) is the output control and should be used to gate data to the output pins, independent of device selection. Assuming that the addresses are stable, the address access time (tAVQV) is equal to the delay from E to output (tELQV). Data is available at the output after a delay of tGLQV from the falling edge of G, assuming that E has been low and the addresses have been stable for at least tAVQV-tGLQV. 2.2 Standby mode The M27W512 has a standby mode which reduces the supply current from 15mA to 15µA with low voltage operation VCC ≤ 3.6V, see Table 7: Read mode DC characteristics. Characteristics table for details. The M27W512 is placed in the standby mode by applying a CMOS high signal to the E input. When in the standby mode, the outputs are in a high impedance state, independent of the GVPP input. Table 2. Operating modes(1) 1. X = VIH or VIL, VID = 12V ± 0.5V. Mode E GVPP A9 Q7-Q0 Read VIL VIL X Data Out Output Disable VIL VIH X Hi-Z Program VIL Pulse VPP X Data In Program Inhibit VIH VPP X Hi-Z Standby VIH X X Hi-Z Electronic Signature VIL VIL VID Codes Table 3. Electronic signature Identifier A0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Hex data Manufacturer code VIL 00 100 000 20h Device code VIH 00 111 101 3Dh |
Similar Part No. - M27W512_08 |
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Similar Description - M27W512_08 |
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